<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/task6.css">
</head>
<body>
<header>
  <!--锚点+target实现下拉菜单-->
    <div class="drow-cd">
        <a href="#cd">所在地</a>
        <div id="cd" class="menu">
            <ul>
                <li>a <div class="fgy"></div></li>
                <li>a</li>
                <li>a</li>
                <li>a</li>
            </ul>
        </div>
    </div>
    <!--伪类实现侧边栏-->
</header>
</body>
</html>